Nuclear Criticality Safety Engineer

AtkinsRealis

US.TN.Oak Ridge.ORNL, United States

Full Time

Posted September 3, 2026

$57k - $125k

Nuclear Energy

Apply Now

Application opens on company website

Listing evidence and provenance

Source: Workday View original listing
Freshness: Open in the current public read path; this is not an employer guarantee.Last observed October 7, 2026
Classification: Modern power-system classification not yet published for this listing.Legacy source industry field: Nuclear Energy
Pay provenance: Employer-provided pay

Job Description

We are seeking a Nuclear Criticality Safety Engineer Energy, to join our Team in our Oak Ridge, TN office.

Key Responsibilities

Stops work without fear of reprisal for unsafe conditions potentially affecting personnel safety or environmental risk.
Supports implementation of the Nuclear Criticality Safety (NCS) Program.
Supports facility activities to ensure criticality safety.
Prepares and peer reviews NCS documents Fissile Material Operations (FMO) Screens, NCS Evaluations (NCSEs), NCS Approvals
(NCSAs), NCS Clarifications, NCS Reports, and Criticality Accident Alarm System Needs Analyses.
Performs NCSE/A implementation walkdowns and provides input to site emergency plans and pre-incident plans, as requested.
Maintains awareness with assigned FMOs and NCS-related issues within Project.
Participates in critiques/investigations involving NCS issues.
Reviews Conditions Adverse to Quality (e.g., Non-Conformance Reports, Findings) for NCS impacts.
Performs audits, surveillances, and assessments of the NCS Program and Project conformance to NCSA and NCS-related contract
requirements.
Reviews and approves work packages, procedures, administrative aids, and other Project documents to ensure compliance with NCS
Reviews and approves designs and plans that potentially impact NCS.
Reviews applicable facility Safety Basis documents for NCS integration.
Participates in Hazard Evaluation Studies/Hazards Analysis in support of Project activities.
Identifies the need for NCS training to support Project activities.
Provides delivery of NCS training and the evaluation of its effectiveness.
Maintains knowledge of NCS-related standards, guides, and codes.
Supports the execution of Integrated Safety Management System guiding principles and core functions and the Isotek Safety Culture.
Performs other duties as assigned.

Requirements

Requires a Baccalaureate Degree in Engineering.
Minimum 2 years’ related experience, 1-year nuclear experience.
Applicants selected will be subject to a Federal background investigation and must meet eligibility requirements for access to classified information or matter.
Proficient knowledge of Microsoft Office.
Strong communication, verbal and written skills.
Ability to describe the essential requirements, relationships and importance of applicable DOE Orders and Standards with respect to NCS.
Ability to perform calculations with Monte Carlo neutron transport codes.
Ability to perform hand calculations for criticality.
Applicants must have Real ID compliant identification to access the work location.
U.S. citizenship required for AtkinsRéalis/Isotek Systems Project positions.
Must be a U.S. citizen in order to be considered.

Benefits & Perks

At AtkinsRéalis, our values—Safety, Integrity, Collaboration, Innovation, and Excellence—are more than just words. They are the foundation of who we are and how we work. These principles shape our culture, guide our decisions, and inspire us to create an environment where every team member feels empowered to grow, succeed, and make a meaningful impact.
Depending on your employment status, AtkinsRéalis benefits may include medical, dental, vision, company-paid life and short- and long-term disability benefits, employer-matched 401(k) with 100% vesting, employee stock purchase plan, Paid Time Off, leaves of absences options, flexible work options, recognition and employee satisfaction programs, employee assistance program, and voluntary benefits. You can review our comprehensive benefits page here .